Partially hydrolyzed chitosan (0.4 g) was suspended
in 20 mL of methanol/acetic acid (3 : 1 v/
v) and 1.33 g of d-(+)-glucosamine hydrochloride
in 15 mL of water, and 1.0 g of sodium cyanoborohydride
was added. The mixture was stirred for 6 d
at room temperature, filtered and the solid was
washed exhaustively with methanol and dried to
give a white powder, soluble in water (67% yield).
Analysis: Calcd. (%) for [(C8H13O5N)0.3 · (C18H24
O8N2)0.43 · (C6H11O4N)0.27)]n: C 37.92, H 6.95, N
4.44; found (%): C 37.89, H 6.95, N 4.50.